Over the last several decades, researchers have examined how our cities deplete natural resources and change the climate and ecosystems of their surrounding areas. But new evidence shows that such impacts aren't a purely modern phenomenon.
Back in 2001, Jim Starry proposed a radical rethink of airport design, with inclined runways and gates on top of terminals and parking lots. Lost in the 9/11 shuffle, Sarah Rich takes a second look at the idea.
Urban agriculture is becoming a well-known idea all around the world. Most of it is done at the small-scale, but there's still the idea of creating large skyscraper farms to feed our cities. <em>Smithsonian</em> takes a look at the idea.